Til R \Y \ TIC ft SCA VKN(S RH R R RTL'fiS. 



251 



480 (1550). Helophorus lineatus Say, Journ. Phil. Acad. Nat. Sci., III. 



200; ibid. II, 128. 



Elongate-oblong. Above light brown with a greenish 

 tinge ; elytra often with fuscous markings, of which an 

 inverted V on suture behind middle and two spots each 

 side are most obvious ; antennae and legs pale. Inter- 

 mediate sulci of thorax, deep, narrow, very strongly 

 curved or subangulate near middle. Elytral striae with 

 deep, dilated transverse punctures. Length 2.8-3.5 mm. 

 (Fig. 124.) 



Throughout the State ; frequent. April 11-Oc- 



tober 17. (Original.) 



481 (1546). Helophorus linearis Lee, Proc. Phil. Acad. Nat. Sci., 1855, 



357. 



Elongate, slender. Dull brownish-yellow ; head and thorax tinged with 

 greenish ; elytra clouded with fuscous. Thorax one-half wider than long, 

 granulate ; intermediate sulci feebly sinuate. Length 3 mm. 



Millers, Lake County; rare. May 25. Recorded from Buffalo, 

 New York, Nebraska and Canada. 



482 (1553). Helophorus tuberculatus Gyll., Ins. Suec, 1827. 

 Elongate, convex. Dull black, tinged with greenish. Third elytral in- 

 terval with four elevations, the basal one oblong; fifth and seventh each 

 with three. Length 3.5 mm. 



Beneath rubbish close to water on beach of Lake Michigan, near 

 Pine and Millers, Lake County ; scarce. April 23-June 24. 



II. Hydrochus Leach. 1817. (Gr., "relating to water.") 



Thorax much narrower than elytra, its breadth being equal to or 

 only slightly exceeding the length; disk usually marked with small 

 cups or foveas. The following species have been taken or may oc- 

 cur in the State. 



KEY TO INDIANA SPECIES OF HYDROCHUS. 



a. Larger, 5.5 mm. ; elytra with intervals flat and much wider than stria?, 

 the fourth with large oblique tubercles. scabratus. 

 aa. Smaller, not over 4.5 mm.; intervals convex. 



b. Thorax with five more or less distinct fovea? or cup-shaped impres- 

 sions. 



c. Stria? of elytra as wide as or wider than intervals ; thorax with 

 granules between the punctures. 

 (I. Sides of thorax distinctly sinuate near base, not crenulatc; 

 length 3.8-4 mm. 4S3. squamifer. 



(Id. Sides of thorax finely crenujate. 



e. Smaller, not over 3 mm. ; sides of thorax snbsinuate. 



484. INJEQUAL.1S. 



